New coplanar (ABA)n-type donor-acceptor π-conjugated copolymers constituted of alkylthiophene (unit A) and pyridazine (unit B): Synthesis using hexamethylditin, self-organized solid structure, and optical and electrochemical properties of the copolymers

Takuma Yasuda, Yoshimasa Sakai, Shinji Aramaki, Takakazu Yamamoto

研究成果: Contribution to journalArticle査読

124 被引用数 (Scopus)

抄録

A new series of π-conjugated (ABA)n-type polymers constructed of electron-donating thiophene or 3-alkylthiophene (as the unit A) and electron-accepting pyridazine (as the unit B) were synthesized via palladium-catalyzed dehalogenative polycondensation of Br-ABA-Br using hexamethylditin as the condensing reagent. The obtained polymers were characterized by NMR, IR, and elemental analysis. The polymers with alkyl side chains were soluble in organic solvents, and gave number-average molecular weights ranging from 3.2 × 104 to 16 × 104 in gel-permeation analysis. The polymers exhibited strong green photoluminescence (PL) with the peak in the range of 510-520 nm and quantum yields of 51-61% in chloroform. The PL intensity was sensitive toward acids. In films, the UV-vis and PL peaks shifted to a longer wavelength by about 30-40 nm. Powder X-ray diffraction data suggested that the polymer formed a highly ordered π-stacked assembly assisted by the side chain crystallization and dipole-dipole interaction. Cyclic voltammetry revealed that the polymer was susceptible to both electrochemical p- and n-doping, and the n-doping peak appeared in the range of -2.15 to -2.28 V vs Ag+/Ag. The polymer served as a good material for a thin-film field-effect transistor and gave a hole mobility of 3 × 10-3 cm2 V-1 s-1.

本文言語英語
ページ(範囲)6060-6068
ページ数9
ジャーナルChemistry of Materials
17
24
DOI
出版ステータス出版済み - 11 29 2005
外部発表はい

All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 化学工学(全般)
  • 材料化学

フィンガープリント

「New coplanar (ABA)<sub>n</sub>-type donor-acceptor π-conjugated copolymers constituted of alkylthiophene (unit A) and pyridazine (unit B): Synthesis using hexamethylditin, self-organized solid structure, and optical and electrochemical properties of the copolymers」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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